Hi Beverly,
Well it certainly sounds as if the rock is cured! Actually I almost always buy pre-cured rock with no problems. Still, always better safe than sorry, keep it in the water for a couple of days, check for smell, and the usual suspects, and plunk that sucker in!
Besides, depending on the size of the tank and the inhabitants of course, a 7 pound of ALMOST cured rock might not make a huge difference.
Good luck!
Rob
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